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2004 mercury mountaineer.heat problem When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.

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2004 mercury mountaineer.heat problem
When turning ac knob to heat clicking sound like door opening and closing repeatedly sounds and air blows cold instead of hot.

Posted on Nov 11, 2010

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Posted on Jan 02, 2017

ftw1952
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SOURCE: 2004 mercury mountaineer.heat problem When turning

Most likely the blend door actuator has a stripped gear on it causing the noise you hear. Since it runs repeatedly the stop on the gear has sheared off making it run like this

Posted on Sep 26, 2010

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I have a 2004 Mercury Mountaineerthat blows out cold air so I changed the thermostat and it is still blowing out cold air and there is a knocking sound right below the thermostat gauges,could it be in the...


It sounds like the motor that opens the heat blend door is malfunctioning... They sell them for most makes and models at your local part store... Also a Haynes or Chilton manual to give you specific direction for your vehicle. Also try removing both heater hoses from your heater core at the firewall and now compressed air through the heater core... It may be restricted

Nov 22, 2014 | 2004 Mercury Mountaineer

1 Answer

I have no heat in my 2004 mercury mountaineer and i have lights that do what they want ,,what is going on with this


number of possibilites for no heat.

1. Your engine thermostat is broken and stuck in the on possistion. In the winter months, if its stuck in the open posistion, the vehicle may never get warm enough for the heater to blow hot air (i had this problem once, 13 degrees outside and even tho we had been driving for an hour, not a single bit of warm air... fixed instantly with new thermostat) this is a cheap repair

2. you have a clogged/broken or something has happened to your heater core, it is located in the dash somewhere and hot coolant flows into it. This is not terribly expensive, but labor cost may be a bit high, sometimes there not easy to get to

3. and least likely is that your heater door wont open. Does your a/c still work fine? if yes, if you leave the ac on, and turn it from cold to hot, does it stay exactly same temp or cold? or slightly warmer? if it stays the exact same tempature of cold and you cant tell that anytinh has changed, the door that closes the ac and opens to heater could be stuck/broken, etc. or the cable or electric wire controlling it could be bad..

that concludes 3 reasons you could be without heat, as far as your electrical goes, I would make sure all your fuses are in good, otherwise, who knows, electrical in cars is a whole nother ball game

Nov 01, 2013 | 2002 Mercury Mountaineer

1 Answer

When i turn the heat on it makes a clicking sound, and it blows out cold air, but when i turn cold temp on the clicking sound stops, until heat temp is turned back on. please tell me how to fix this...


Your ac blend door is broken or the actuator that opens and closes the door is broken. The ac blend door moves up and down to direct air flow through the heater core(for heating) or evaporator core(for cooling).

When the door mechanism breaks, the blend door falls down and you will only have ac but no heating.

You can buy a ac blend door kit for your explorer, they cost about $120 on ebay or other places.
search for Explorer ac blend door kit.

The duct is under the the dash on the drivers side. And you will have to cut open the duct to install the replacement door.

Heres a link to a tutorial of how to do the job.

http://www.heatertreater.net/Ford%20Explorer%2002-08.html

Sep 19, 2011 | 2004 Ford Explorer

1 Answer

The heater on my 2004 mercury mountaineer does not work. When turning the dial from ac to heat, cold air blows out while a sound like a door opening and shutting is heard.


there is a vacuum ran valve on your heater hoses goin in to your heater core on the fire wall, they tend to get stuck shut n dont open to let hot anti freeze in the heater core, so cold air right, qwik fix is find the valve on heater core inlet and wire tie it open so antifreeze circulates no matter what, this is known on ford explorers. pretty much same truck.

Dec 16, 2010 | 2004 Mercury Mountaineer

1 Answer

2004 mountaineer when changing from hot to cold in climate control. There is something banging under dash. cannot get to go back to heat.


If I understand your problem, what you actually hear is a "clicking" sound. If I am correct, your unit only blows out cold air. If so, your problem is the "Heating & AC blend door actuator. It is a small plastic box that contains plastic gears. The unit receives an electric signal to change positions, but the broken cogs prevent the unit from operating properly. A quick check to determine if this is your problem, turn the heater on. Adjust the temperature from heat to air. At some point the noise will stop.

Apr 24, 2010 | 2004 Mercury Mountaineer

2 Answers

Pulled Fuse 30- to stop horrible continuous clicking noise even when heat/ac turned off. Fuse is for:daytime running lamps, remote solenoid, deatc climate controller, manual climate control, manual climate...


i had the same problem with mine only the noise was coming from the rear driver side where the rear ac motor is. the culprit was the motor that opens the baffle regulating the hot and cold air. the teeth on the the motor are plastic and a couple wore off and while trying to open the baffle would make the clicking sound. its a little hairy getting that motor out do to close quarters but a friend helped me and its fixed now. the motor cost me about 75 bucks. good luck hope this helps

Dec 08, 2009 | 2003 Mercury Mountaineer

1 Answer

Ac not blowing cold air.


Sounds like the compressor has failed.

Apr 19, 2009 | 1997 Mercury Mountaineer

1 Answer

No heat


The clicking noise is a defective air temp control blend door motor, this is all to common and issue, to repair the defective part the dash must be removed.

Nov 17, 2008 | 2004 Mercury Mountaineer

3 Answers

Heating and cooling


You can't even reach the door without pulling the dash assembly out, then u might as well fix the problem,

Nov 06, 2008 | 1997 Mercury Mountaineer

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